function prihlasovani_zmena (metoda){
    if(metoda == 'openid'){
        document.getElementById('prihlasovani_pole').innerHTML = 'OpenID: <input type="text" name="openid" style="padding: 0px; height: 18px; width: 318px"; />\n';
    }
    else if(metoda == 'seznam'){
    document.getElementById('prihlasovani_pole').innerHTML = 'Email: <input type="text" name="email" style="padding: 0px; height: 18px; width: 206px;"/>\n<select name="domena" style="width: 120px;">\n<option value="seznam">@seznam.cz</option>\n<option value="email">@email.cz</option>\n<option value="post">@post.cz</option>\n<option value="spoluzaci">@spoluzaci.cz</option>\n<option value="stream">@stream.cz</option>\n<option value="firmy">@firmy.cz</option>\n</select>\n';
    }
    else if(metoda == 'google'){
    document.getElementById('prihlasovani_pole').innerHTML = 'Email: <input type="text" name="email" style="padding: 0px; height: 18px; width: 267px;"/>@gmail.com\n';
    }
    else{
        document.getElementById('prihlasovani_pole').innerHTML = 'Login: <input type="text" name="login" style="padding: 0px; height: 18px; width: 142px;" />\nHeslo: <input type="password" name="heslo" style="padding: 0px; width: 142px; height: 18px;" />\n';
    }
}